Israeli authorities detained French-Palestinian lawyer Salah Hamouri, who allegedly belongs to the Popular Front for the Liberation of Palestine, without a trial on Thursday.
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Three days after his arrest, Israel issued a four-month administrative detention order against Hamouri, an east Jerusalem resident, Haaretz reported.
Hamouri has represented Palestinian prisoners and worked for the nongovernmental organization Addameer, which Defense Minister Benny Gantz declared a terrorist organization and a front for the PFLP.
The United States and Europe, though, said there was little evidence to support such a designation.
In November of last year, three groups – Amnesty International, Front Line Defenders, and Citizen Lab – reported that Hamorui was one of six Palestinian activists whose phone was tapped by NSO Group's Pegasus spyware.
Prior to his arrest, Hamouri had been fighting Interior Ministry plans to void his residency status and deport him.
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Addameer said the allegations of Hamorui being involved in "terrorist activity or belonging to a terrorist group" were based on confidential evidence, Haaretz reported.
In 2005, Hamorui was convicted for membership in the PFLP participating in a plot to kill former Sephardic Chief Rabbi Ovadia Yosef, and spent seven years in prison.
He was released early as part of a prisoner swap to free Gilad Shalit, an Israeli soldier captured by Hamas in 2006 on the eve of the Second Lebanon War.
i24NEWS contributed to this report.